Penumbra: Overture crash. OpenAL

[Luis]

I seem to have a problem with my Penumbra: Overture. For some reason, starting this morning, I cannot successfully start the game up. When I click it, the screen goes black, blinks back to the desktop, black again, and then it crashes with the error message:

FATAL ERROR:
Failed!Check your OpenAL installation.

Then nothing, I press okay and that's it. I tried installing OpenAL, that did nothing, so what do I do? I run a Windows Vista, NVIDIA GeForce 9600 GT, and run the game off of Steam. Please help me.

When you say "For some reason, starting this morning, I cannot successfully start the game up", you mean than you could start it before?
Make sure you have the latest drivers for your sound card. Also, what OpenAL redistributable did you install?